CVE-2023-37390

Themesflat Addons For Elementor <= 2.0.0 - Unauthenticated PHP Object Injection

2023-08-07 00:00
Robert Rowley

Strategic Overview

Status
Patched in 2.0.1
Affected Plugin
Themesflat Addons For Elementor
Affected Version
<= 2.0.0
CVSS
9.8Critical
Weakness type
CWE-502 · Deserialization of Untrusted Data
CVE
CVE-2023-37390
View all Themesflat Addons For Elementor vulnerabilities

At a glance

CVE-2023-37390 is a critical-severity Deserialization of Untrusted Data vulnerability in the Themesflat Addons For Elementor WordPress plugin, affecting versions <= 2.0.0. It carries a CVSS score of 9.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 2.0.1; sites on affected versions should update now. Disclosed August 2023, reported by Robert Rowley.

Vulnerability Overview

The Themesflat Addons For Elementor plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 2.0.0 via deserialization of untrusted input through the 'settings' parameter retrieved from the tf_product_filter nopriv AJAX action. This allows unauthenticated attackers to inject a PHP Object. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-502: Deserialization of Untrusted Data

Themesflat Addons For Elementor <= 2.0.0 carries this weakness at settings, and reaching it takes no account at all. Deserialization of untrusted data means the application reconstructs objects from input a caller controls, letting the attacker choose which classes get instantiated and what their properties hold.

A workable chain turns deserialization into file writes, deletions or code execution, depending on what the loaded classes do in their magic methods. For Themesflat Addons For Elementor the fix is 2.0.1: builds <= 2.0.0 are affected, anything from 2.0.1 onward is not.

Remediation

Update to version 2.0.1, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: Themesflat Addons For Elementor 2.0.1 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Scanner
  • Login Security

External References

https://www.cve.org/CVERecord?id=CVE-2023-37390https://www.wordfence.com/threat-intel/vulnerabilities/id/f33d080c-6d64-46d1-b01c-ef859106159fhttps://nvd.nist.gov/vuln/detail/CVE-2023-37390

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C